Since 2008, Hélène Darroze has been the marquee chef at the famed Connaught hotel in London, serving lunch and dinner in the sumptuously appointed dining room just Monday through Friday.

But this year the hotel management decided to keep the restaurant, which has two Michelin stars, open seven days a week.

“I didn’t want to serve the same menu on the weekends,” Ms. Darroze told me after I dined there on a Sunday. So she reached into her memories of growing up in Gascony, France, where “we always had a chicken dinner on Sundays.”

Le Poulet du Dimanche, a weekend menu for two, is feast enough to thrill a French king, Henry IV, who prized poultry: Legend has it that he wanted every workman in his realm to have a chicken in the pot on Sundays.

Here the egg came first: yolk confit in a gilded shell with bacon. Eggs were also last, in a glorious floating island. In between came three chicken dishes, beginning with a rich, almost smoky consommé “as Henry IV would have wished it,” the menu said: with tiny ravioli and a splash of Armagnac.

Then the captain presented deeply burnished roast chicken in the style of Ms. Darroze’s “Grandmother Louise,” with foie gras under the skin. (This insertion has since been changed to morels and black truffles.) We were served only the breast; the legs were reserved to stuff the next dish, a taco with avocado, refreshing cucumber and herbs.

Finally, the desserts — not just the floating island but also crème caramel, madeleines and assorted petits fours — demanded sampling before we staggered out. For all this, the tariff for two was 95 pounds, about $126 at the friendly conversion rates now in place. Drinks are not included.